RFR: 8291508: Fix some tests with "requires vm.jvmti & vm.continuations" [v4]

[Ao Qi]

> `vmTestbase/nsk/jvmti/GetThreadInfo/thrinfo001/TestDescription.java` and `vmTestbase/nsk/jvmti/RedefineClasses/StressRedefineVirtual/StressRedefineVirtual.java` are added or modified by [JDK-8284161](https://bugs.openjdk.org/browse/JDK-8284161), and they are failed if Loom or JVMTI is not supported.
> 
> The issue could be reproduced by zero.

Ao Qi has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:

 - Merge branch 'master' into 8291508
 - XMLDecoder tests are filed in JDK-8291640
 - XMLDecoder update
   
   Co-authored-by: Alan Bateman <alanb at openjdk.org>
 - 8291508: Fix some tests with "requires vm.continuations"

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/9677/files
  - new: https://git.openjdk.org/jdk/pull/9677/files/97c38a36..1e00cd83

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9677&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9677&range=02-03

  Stats: 2659 lines in 193 files changed: 1590 ins; 605 del; 464 mod
  Patch: https://git.openjdk.org/jdk/pull/9677.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9677/head:pull/9677

PR: https://git.openjdk.org/jdk/pull/9677